Alert archive / Indiana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 126, NWS Indianapolis, IN
NWS Indianapolis, IN issued this severe thunderstorm warning at Jul 18, 1998, 8:42 AM EST for Boone County, Indiana. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 18, 1998, 8:42 AM EST (13:42 UTC)
- Expired
- Jul 18, 1998, 9:15 AM EST
- In force
- 33 min
- Issued by
- NWS Indianapolis, IN
- Area
- Whole counties
County Boone County, IN
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 1.7 hours before the alert went out and 182 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 341 J/kg
- Mixed-layer CIN
- -124 J/kg
- Mixed-layer LCL
- 973 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 191 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.5
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jul 18, 4:00 AM EST, 4 hours 42 minutes before
INZ021-028>031-035>049-051>057-060>065-067>072-181500- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE INDIANAPOLIS IN 400 AM EST SAT JUL 18 1998 THUNDERSTORMS ARE POSSIBLE OVER SOUTHWEST INDIANA TODAY BUT NO SEVERE WEATHER OR SPOTTER ACTIVATION IS ANTICIPATED. SEVERE THUNDERSTORMS ARE POSSIBLE SUNDAY AND SUNDAY NIGHT OVER CENTRAL AND NORTHERN INDIANA SO SPOTTER ACTIVATION MAY BE NEEDED SUNDAY. INCREASINGLY WARM AND HUMID AIR WILL BE RETURNING TO INDIANA THIS WEEKEND...ESPECIALLY SUNDAY. A WEAK UPPER AIR DISTURBANCE MOVING ACROSS THE GREAT LAKES SUNDAY WILL ENHANCE LIFT OF UNSTABLE AIR WHILE A SURFACE WARM FRONT CONVERGES THE MOISTURE INTO STORMS. TUCEK
Special weather statement, Jul 18, 4:00 AM EST, 4 hours 42 minutes before
INZ021-028>031-035>049-051>057-060>065-067>072-181500- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE INDIANAPOLIS IN 400 AM EST SAT JUL 18 1998 THUNDERSTORMS ARE POSSIBLE OVER SOUTHWEST INDIANA TODAY BUT NO SEVERE WEATHER OR SPOTTER ACTIVATION IS ANTICIPATED. SEVERE THUNDERSTORMS ARE POSSIBLE SUNDAY AND SUNDAY NIGHT OVER CENTRAL AND NORTHERN INDIANA SO SPOTTER ACTIVATION MAY BE NEEDED SUNDAY. INCREASINGLY WARM AND HUMID AIR WILL BE RETURNING TO INDIANA THIS WEEKEND...ESPECIALLY SUNDAY. A WEAK UPPER AIR DISTURBANCE MOVING ACROSS THE GREAT LAKES SUNDAY WILL ENHANCE LIFT OF UNSTABLE AIR WHILE A SURFACE WARM FRONT CONVERGES THE MOISTURE INTO STORMS. TUCEK
Special weather statement, Jul 18, 6:00 AM EST, 2 hours 42 minutes before
INZ021-028>031-035>049-051>057-060>065-067>072-182000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE INDIANAPOLIS IN 600 AM EST SAT JUL 18 1998 ...EXCESSIVE HEAT LIKELY THIS COMING WEEK... A LARGE DOME OF HOT AIR OVER THE CENTER OF THE NATION WILL BE BUILDING EASTWARD INTO INDIANA. FOR MONDAY THROUGH WEDNESDAY...HIGH TEMPERATURES MAINLY IN THE MIDDLE TO UPPER 90S...COUPLED WITH HIGH HUMIDITY WILL LIKELY YIELD DAYTIME HEAT INDICES AT OR ABOVE 105 DEGREES. THE HEAT INDEX IS A MEASURE OF THE COMBINED EFFECT OF TEMPERATURE AND HUMIDITY. WITH HEAT INDICES ABOVE 105 DEGREES...YOUR BODY HAS A HARD TIMING COOLING ITSELF...POSSIBLY LEADING TO HEAT EXHAUSTION OR HEAT STROKE. REDUCED OUTDOOR ACTIVITY AND LIGHTWEIGHT CLOTHING IS RECOMMENDED. ALSO TRY AND STAY OUT OF THE SUN AS MUCH AS POSSIBLE AND DRINK PLENTY OF WATER. ENSURE AIR CONDITIONING AND/OR FANS ARE WORKING PROPERLY AND BE SURE TO CHECK ON THE ELDERLY. LONG RANGE COMPUTER MODELS ALSO SUGGEST THIS HEAT WAVE COULD LAST INTO NEXT WEEKEND THOUGH SOME RELIEF MAY BE POSSIBLE FOR THE NORTH BY THURSDAY. TUCEK
Special weather statement, Jul 18, 6:00 AM EST, 2 hours 42 minutes before
INZ021-028>031-035>049-051>057-060>065-067>072-182000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE INDIANAPOLIS IN 600 AM EST SAT JUL 18 1998 ...EXCESSIVE HEAT LIKELY THIS COMING WEEK... A LARGE DOME OF HOT AIR OVER THE CENTER OF THE NATION WILL BE BUILDING EASTWARD INTO INDIANA. FOR MONDAY THROUGH WEDNESDAY...HIGH TEMPERATURES MAINLY IN THE MIDDLE TO UPPER 90S...COUPLED WITH HIGH HUMIDITY WILL LIKELY YIELD DAYTIME HEAT INDICES AT OR ABOVE 105 DEGREES. THE HEAT INDEX IS A MEASURE OF THE COMBINED EFFECT OF TEMPERATURE AND HUMIDITY. WITH HEAT INDICES ABOVE 105 DEGREES...YOUR BODY HAS A HARD TIMING COOLING ITSELF...POSSIBLY LEADING TO HEAT EXHAUSTION OR HEAT STROKE. REDUCED OUTDOOR ACTIVITY AND LIGHTWEIGHT CLOTHING IS RECOMMENDED. ALSO TRY AND STAY OUT OF THE SUN AS MUCH AS POSSIBLE AND DRINK PLENTY OF WATER. ENSURE AIR CONDITIONING AND/OR FANS ARE WORKING PROPERLY AND BE SURE TO CHECK ON THE ELDERLY. LONG RANGE COMPUTER MODELS ALSO SUGGEST THIS HEAT WAVE COULD LAST INTO NEXT WEEKEND THOUGH SOME RELIEF MAY BE POSSIBLE FOR THE NORTH BY THURSDAY. TUCEK
Nearby
Severe Thunderstorm Warnings in Indiana, 1998Every severe thunderstorm warning in 1998
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.